Add Atmel I2C tpm

Add support for Atmel TPM devices with two wire interface.

Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc>
Signed-off-by: Reinhard Pfau <reinhard.pfau@gdsys.cc>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/drivers/tpm/Makefile b/drivers/tpm/Makefile
index 913dd9c..c3010ba 100644
--- a/drivers/tpm/Makefile
+++ b/drivers/tpm/Makefile
@@ -26,6 +26,7 @@
 $(shell mkdir -p $(obj)slb9635_i2c)
 
 # TODO: Merge tpm_tis_lpc.c with tpm.c
+COBJS-$(CONFIG_TPM_ATMEL_TWI) += tpm_atmel_twi.o
 COBJS-$(CONFIG_TPM_TIS_I2C) += tpm.o
 COBJS-$(CONFIG_TPM_TIS_I2C) += tpm_tis_i2c.o
 COBJS-$(CONFIG_TPM_TIS_LPC) += tpm_tis_lpc.o